peak wattage can mean a lot of things so it really means nothing. What you should pay attention to is measurements, preferably third party measurements. There aren't any right now for the Power Sound subs, but they do look like good subs. "Room gain" is what your room may do to acoustically boost the low frequencies, but it isn't the natural frequency response of the sub, and also room gain is different for every room. The VTF3 has a real measured response of 16 hz without room gain, I do think it would have an advantage in extension, however I think the XV15 would get louder above the deep frequencies. Basically I think this is a choice between output vs extension. They each have different features as well.